#31  
Old 08-10-2009, 08:51 PM
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Default Re: Smaug: A 36" x 16" build - A dome design question

Martin,

I would imagine that the curve of my dome approximates a section of a sphere. I drew it by bending a metal ruler between two points until it looked like what I wanted. Designing it in google sketchup, I used the arc tool with a 2" bend. I am a geometry dummy and could not tell you the difference between an arc and an ellipse. No worries at all about the flat part of the dome being self-supporting. When you are constructing the dome, you will see that with just the slightest angle the bricks will hold each other in place

I think that the shape with the 9" soldier course that you have in mind will be good for bread baking--it will give you more volume in the lower part of the dome. If I were doing mine again, I would use the soldier course shape, but not the soldier brick layout even though I really like the look. I would use half-bricks for the first three courses, have them rise vertically, and lay the bricks on bond (if that is the proper bricklayers term of art.)

Good luck with your build. I look forward to following it. Post pics!
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  #32  
Old 08-11-2009, 03:57 AM
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Default Re: Smaug: A 36" x 16" build.

Looking good David! I am not far behind you with my oven curing happening this Friday. I hope my pizzas look as good as yours do and I am sure your tasted as good as they looked. Unlike you I don't yet have tools or even the right flour yet but I will take a trip to the local WFO pizza shop and see if he will let out some secrets as far as his flour supplier goes.
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Smaug: A 36" x 16" build.-dscn0161.jpg  
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  #33  
Old 08-13-2009, 01:33 PM
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Default Re: Smaug: A 36" x 16" build.

Here is a picture of the elliptical curve for the dome - you can see how flat it would be for a large section. My more experienced helper, Les, took one look at it and said that he was concerned (code for "that will never work"). I will probably adopt your approach and go for a part-sphere. I have just drawn out the curve that will give me a dome height of just under 19" and it looks more practical - I am awaiting approval from Les!

Construction started todayso I will start a thread and document the build with photographs.

Martin.
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  #34  
Old 08-31-2009, 07:16 PM
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Default Re: Smaug: A 36" x 16" build.

After about 10 firings, I decided to peel back the insulation and take a look at a crack that had developed during the curing fire. It looked worse from the outside than I expected, so I decided to buttress the dome with a few steel cables. One cable is anchored to the hearth slab and strung over the entry arch; it is kind of hard to see in the photos. I put the cables on the outside of the 1st blanket to protect them from the heat.
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Smaug: A 36" x 16" build.-a1.jpg   Smaug: A 36" x 16" build.-a2.jpg   Smaug: A 36" x 16" build.-a3.jpg   Smaug: A 36" x 16" build.-a4.jpg   Smaug: A 36" x 16" build.-a5.jpg  

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  #35  
Old 08-31-2009, 10:52 PM
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Default Re: Smaug: A 36" x 16" build.

David, that is a crack for sure, what does it look like on the inside? Do you think you should fill the crack with a heat resistant filler as some others on the forum have done with success?
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  #36  
Old 08-31-2009, 11:19 PM
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Default Re: Smaug: A 36" x 16" build.

Hey Rodney.
What is it, like the middle of the afternoon for you now? ( 1:00am here)

Lars.
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  #37  
Old 09-01-2009, 12:03 AM
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Default Re: Smaug: A 36" x 16" build.

It is a gorgeous sunny afternoon at about 22C and a slight westerly breeze.
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  #38  
Old 09-01-2009, 04:57 PM
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Default Re: Smaug: A 36" x 16" build.

Aw, David,
Why a crack? Do you know when it happened on your firing schedule? Without knowing the inside crack size, I would say it is about the same as mine. I don't think any heat escapes with the 3-4 layers of ceramic blanket I've got so I don't think you have anything to worry about, structurally or heat wise. You've been cooking in it so it's working fine and it's still a beautiful oven you've made, that's what's important to remember. If you decide to add any refmix to patch, it will make the gap a bit smaller but it will crack along there anyway. I filled my outside crack but I probably shouldn't have bothered. Cheers, Dino
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  #39  
Old 09-01-2009, 06:19 PM
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Default Re: Smaug: A 36" x 16" build.

Here is a fuzzy pic from the inside; it has opened up a little more since this pic was taken.

The crack happened right in between when the oven turned black and when it turned back white. So, I know exactly when it happened plus or minus 18 hours.

I was more worried about it from a structural standpoint than from a worry about heat escaping--not much gets through three overlapping layers of the blanket. I was afraid I might push my hoe/rake right through the soldier wall in an errant blow. I have not decided whether to seal it up from the inside with anything. Anybody have any links to suggested products? Any good reason to bother with it?

One interesting datapoint: When I peeled back the insulation, it was a day after firing. Midway up the dome, the IR gun gave an inside reading of 350F and the same point on the outside of the dome was 340F. I would love to know the outside temperature right at the two hour point of intense firing.
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  #40  
Old 09-01-2009, 07:21 PM
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Default Re: Smaug: A 36" x 16" build.

Is it just me, or are we seeing more and worse cracks with the current vogue for full brick height soldiers?
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